Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JPI callsign genealogy
Currently held by Mason, Russell W
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K4JPI's current licensee, walking backwards.
- Mason, Russell WCOgranted 2008-12-16cancelled 2009-01-23
Successor callsigns
Callsigns held now by people who previously held K4JPI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JPI, oldest first.
- MASON, RAY T TN1997-10-28 → cancelled 2002-05-18
- Mason, Russell W MS2019-01-03 active